Dorei-gaeshi no Hangyaku Maou: Saijaku Shuzoku no Akuma ga Kindan Harem wo Kizuku made

A demon reborn in a world where demons are enslaved sets out to become their hope and strongest Demon King. A century after humanity wins the war between humans and demons, the defeated demon race is forced to live as slaves. Liebe, reborn as a demon, serves as a slave and “pet” to the daughter of a noble family on the frontier. Liebe possesses a special eye that lets him see others’ weaknesses. Using this power and magic, he develops a spell that temporarily reverses a slave contract—and decides to use it to rise as a Demon King.